International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya; Social Insects Research Group, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria, 0028, South Africa; Department of Crop Protection, Faculty of Agricultural Sciences, University of Gezira, P.O. Box 20, Wad Medani, Sudan.
Social Insects Research Group, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria, 0028, South Africa.
J Therm Biol. 2020 Apr;89:102534. doi: 10.1016/j.jtherbio.2020.102534. Epub 2020 Feb 14.
The African coffee white stem borer Monochamus leuconotus (Pascoe) (Coleoptera: Cerambycidae) is a destructive insect pest of Arabica coffee trees in African highlands. Our study aims to provide information on the pest biology as influenced by temperature, determine thermal thresholds, and provide life table parameters for M. leuconotus reared in the laboratory. The life cycle of M. leuconotus was studied at seven constant temperatures in the range 15-35 °C, with 80 ± 5% RH and a photoperiod of L:D 12:12. Linear and nonlinear models were fitted to laboratory data to describe the impact of temperature on M. leuconotus development, mortality, fecundity and senescence. The complete life cycle was obtained between 18 and 30 °C, with the egg incubation period ranging 10.8-29.2 days. The development time was longest for the larva, with 194.2 days at 30 °C and 543.1 days at 18 °C. The minimum temperature threshold (T) was estimated at 10.7, 10.0 and 11.5 °C, for egg, larva and pupa, respectively. The maximum temperature threshold (T) was estimated at 37.4, 40.6 and 40.0 °C for egg, larva and pupa, respectively. The optimum temperature for immature stage survival was estimated between 23.0 and 23.9 °C. The highest fecundity was 97.8 eggs per female at 23 °C. Simulated life table parameters showed the highest net reproductive rate (R) of 11.8 daughters per female at 26 °C and maximal intrinsic rate of increase (r) between 26 and 28 °C, with a value of 0.008. Our results will help understanding M. leuconotus biology as influenced by temperature and may be used to predict the distribution and infestation risk under climate warming for this critical coffee pest.
非洲咖啡白茎象甲 Monochamus leuconotus（Pascoe）（鞘翅目：天牛科）是非洲高地阿拉比卡咖啡树的一种破坏性害虫。本研究旨在提供受温度影响的害虫生物学信息，确定热阈值，并为在实验室中饲养的 M. leuconotus 提供生命表参数。在 15-35°C 的 7 个恒温下研究了 M. leuconotus 的生命周期，相对湿度为 80±5%，光照周期为 L:D 12:12。将线性和非线性模型拟合到实验室数据中，以描述温度对 M. leuconotus 发育、死亡率、繁殖力和衰老的影响。在 18-30°C 之间获得了完整的生命周期，卵的孵化期为 10.8-29.2 天。幼虫的发育期最长，在 30°C 时为 194.2 天，在 18°C 时为 543.1 天。卵、幼虫和蛹的最低温度阈值（T）分别估计为 10.7、10.0 和 11.5°C。卵、幼虫和蛹的最高温度阈值（T）分别估计为 37.4、40.6 和 40.0°C。幼虫存活率的最适温度估计在 23.0-23.9°C 之间。最高产卵量为 97.8 个雌性在 23°C。模拟生命表参数表明，在 26°C 时，雌性每只的净生殖率（R）最高为 11.8 只，在 26-28°C 之间，内禀增长率（r）最大，为 0.008。我们的结果将有助于了解温度对 M. leuconotus 生物学的影响，并可用于预测这种关键咖啡害虫在气候变暖下的分布和侵害风险。
